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Test 2 of 6.
This test is a great drivers ed that will help you study for your CDL DISTRICT COLUMBIA (DC) General knowledge test! Take this FREE CDL Practice Test and get closer to obtaining your CDL License NOW! Use this Free CDL Training tool till you get it right!

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1. Question

You are driving a vehicle that can be safely driven at 55 mph on an open road, but the traffic is heavy and moving at 35 mph, though the speed limit is 55 mph. What will be safest speed for your vehicle?

35 mph

25 mph

45 mph

Correct

Incorrect

Question 2 of 40

2. Question

You are driving a heavy vehicle with a manual transmission. You have to stop the vehicle on the shoulder while driving on an uphill grade. Which of these is a good rule to follow when putting it back in motion up the grade?

Keeps the clutch slipping while slowly accelerating

Use the parking brake to hold the vehicle until the clutch engages

Let the vehicle roll backwards a few feet before you engage the clutch but turn the wheel so that the back moves away from the roadway

Correct

Incorrect

Question 3 of 40

3. Question

What is countersteering?

Turning the steering wheel counterclockwise

Using the steering axle brakes to prevent oversteering

Turning the wheel back in the other direction after steering to avoid a traffic emergency

Correct

Incorrect

Question 4 of 40

4. Question

Which of the statements about backing a heavy vehicle is true?

You should avoid backing whenever you can

Helpers should be out of the driver’s sight and use only voice (spoken) signals to communicate with the river

It is safer to back toward the right side if the vehicle than toward the driver’s side

Correct

Incorrect

Question 5 of 40

5. Question

Which statement about marking a stopped vehicle is true?

The vehicles tail lights should be kept on to warn other drivers

If a hill or curve keeps drivers behind you from seeing the vehicle within 500 feet, the rear reflective triangle should be moved down the road to give adequate warning

The vehicle’s taillights should be kept on to warn other drivers

Correct

Incorrect

Question 6 of 40

6. Question

Which of these is the best description of how you should use the brake pedal on a steep downhill grade?

Light, pumping action

Light, steady pressure

Repeated strong pressure and the release

Correct

Incorrect

Question 7 of 40

7. Question

Which statement about using turn signals is true?

You do not need to use your turn signal when changing lanes in traffic on a four-way highway

Signal early when turning

Use your turn signal to mark your vehicle when it is pulled off on the side of the road

Correct

Incorrect

Question 8 of 40

8. Question

Which statement about double clutching and shifting is true?

You can use the tachometer to tell you when to shift

Double clutching should not be used when the road is slippery

Double clutching should only be used with a heavy load

Correct

Incorrect

Question 9 of 40

9. Question

Which statement about speed management is true?

Empty trucks always stop in a shorter distance than fully loaded

When you double your speed (go twice as fast), it will take twice the distance to stop

You should choose a speed that lets you stop within the distance that you can see ahead

Correct

Incorrect

Question 10 of 40

10. Question

Retarders:

Can cause the driver wheels to skid when they have poor traction

Cause extra brake wear

Work when you apply the brake pedal

Correct

Incorrect

Question 11 of 40

11. Question

What should you do to correct a drive wheel braking skid?

Stop braking, turn quickly, and then countersteer

Increase braking

Increase braking, turn quickly, and countersteer

Correct

Incorrect

Question 12 of 40

12. Question

What should you do when exiting or entering on a curved freeway ramp?

Maintain a speed 5-10 mph under the posted speed limit

Maintain the posted speed limit

Slow down to at least 50% of the posted speed limit

Correct

Incorrect

Question 13 of 40

13. Question

Which vehicle has the longest topping distance?

Empty truck

Loaded truck

Bobtail tractor

Correct

Incorrect

Question 14 of 40

14. Question

How many red reflective triangles are you required to carry?

5

3

4

Correct

Incorrect

Question 15 of 40

15. Question

Within how many miles after begging the trip you are required to inspect your truck?

100

150

25

Correct

Incorrect

Question 16 of 40

16. Question

What are the types of jackknife?

Trailer

Tractor

Trailer and tractor

Correct

Incorrect

Question 17 of 40

17. Question

What is the new BAC (blood alcohol concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle?

0.04

0.01

0.10

Correct

Incorrect

Question 18 of 40

18. Question

During the pre-inspection, where should the ignition key be?

In your pocket

In the ignition

On the driver’s seat

Correct

Incorrect

Question 19 of 40

19. Question

If you are loading your trailer and the cargo is loaded all to the rear, this may result in:

Wheel lockup

Damage to steering axle

Poor traction on drive wheels

Correct

Incorrect

Question 20 of 40

20. Question

What does communication mean?

Talking with law enforcement officers

To communicate your intention to other motorists

To talk on the CB radio

Correct

Incorrect

Question 21 of 40

21. Question

What are you most likely to get if you are convinced for driving a commercial vehicle under the influence and this is your first offence?

A probation period for 1 year

At least one year suspension of your CDL

A fine of $500

Correct

Incorrect

Question 22 of 40

22. Question

If you are stopped at a roadside rest area and found to have a BAC (blood alcohol level) of 0.02 you will:

Be placed out of service for 72 hours

Be in deep trouble with your dispatcher

Be placed out of service for 24 hours

Correct

Incorrect

Question 23 of 40

23. Question

Which statement about speed management is true?

If you double your speed, stopping distance will double

Empty truck and loaded trucks will have the same stopping distance

If you double your speed, stopping distance will be increased by 4 times

Correct

Incorrect

Question 24 of 40

24. Question

What should you do when you are traveling down a long, steep hill and your brakes got so hot that they failed?

Downshift and pump the brake pedal

Look for an escape ramp or escape route

Both other answers are correct

Correct

Incorrect

Question 25 of 40

25. Question

What statement about the center of gravity of a load is true?

It should be kept as high as possible

It can make a vehicle more likely to tip over on curves if it is high

It is only a problem if the vehicle is overloaded

Correct

Incorrect

Question 26 of 40

26. Question

In order to prevent a load from shifting, there should be at least one tiedown for how many feet of cargo?10

10

15

20

Correct

Incorrect

Question 27 of 40

27. Question

You should stop driving:

After 5 hours

After 9 hours

Whenever you become sleepy

Correct

Incorrect

Question 28 of 40

28. Question

Which of these is NOT a good rule to follow when caring for injured person at an accident scene?

If a qualified person is helping them, stay out of the way unless asked to assist

Keep an injured person cool

Move severely injured person if there is a danger due to fire or passing traffic

Correct

Incorrect

Question 29 of 40

29. Question

You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help you to keep your brakes working?

Gently putting on the brakes while driving through the water

Applying hard pressure on both the brake pedal and accelerator after coming out of the water

Turning on your brake heater

Correct

Incorrect

Question 30 of 40

30. Question

Which of these statements about drugs is true?

A driver can use any prescription drug while driving

Amphetamine, (“pep pills” or “bennies”) can be used to help the driver to stay alert

Use of drugs can lead to an accident and/or arrest

Correct

Incorrect

Question 31 of 40

31. Question

Which of these is good thing to remember when crossing or entering traffic with a heavy vehicle?

Heavy vehicles need larder gaps in traffic than other cars

The best way to cross the traffic is to pull the vehicle partway across the road and block one lane while waiting for the other to clear

Because heave vehicles are easy to see, you can count on other drivers to move out of your way or slow down for you

Correct

Incorrect

Question 32 of 40

32. Question

You are driving a heavy vehicle. You must exit a highway using a off ramp that curves downhill. You should?

Slow down to a safe speed before the curve

Slow to the posted speed limit for the off ramp

Wait until you are in the curve before down shifting

Correct

Incorrect

Question 33 of 40

33. Question

You must park on a side of a level, straight, four-lane divided highway. Where should you place the reflective triangles?

One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 200 feet to the rear

One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet to the front of the vehicle

One within 10 feet of the front of the vehicle, one about 100 feet to the rear, and one about 200 feet to the rear

Correct

Incorrect

Question 34 of 40

34. Question

You are driving on a two lane road and an oncoming driver drifts into your lane and is headed straight for you. Which of the following is the best action to take?

Break hard

Steer to the right

Steer onto the left shoulder

Correct

Incorrect

Question 35 of 40

35. Question

Brake “fade”:

Can be caused be the brakes getting hot

Can be corrected by letting up on the brakes for 1-2 seconds and them applying them

Is a problem that only occurs with drum brakes

Correct

Incorrect

Question 36 of 40

36. Question

Which of these statements about engine overheating is true?

You should never shut off an overheated engine until it cools off

You should never remove the radiator cap on a pressurized system until the system is cooled

Antifreeze is not needed when the weather is warm

Correct

Incorrect

Question 37 of 40

37. Question

Which of these statements about overhead clearance is true?

You should assume posted clearance sighs are correct

The weight of a vehicle changes its height

Paving a road does not affect the clearance height under bridges or overpasses

Correct

Incorrect

Question 38 of 40

38. Question

Which of these statements about vehicle fire is true?

If cargo in a van or box trailer catches on fire, you should open the cargo door as soon as possible

If your engine is on fire, you should open the hood as soon as you can

A burning tire should be cooled with water

Correct

Incorrect

Question 39 of 40

39. Question

What is the best thing to do when driving on a slippery road?

Use a smaller following distance

Apply the brakes while on curves

Slow down gradually

Correct

Incorrect

Question 40 of 40

40. Question

Which of these statements about acceleration is true?

When traction is poor, more power should be applied to the accelerator

Rough acceleration can cause mechanical damage

You should feel a jerking motion if you accelerate your vehicle properly